Molluscs
What structure in clams produces the shell?
mantle
What is a basic characteristic of arthropods?
hard exoskeleton/jointed legs
What type of symmetry do echinoderms like sea stars have?
5 part radial symmetry
How are seaweeds classified?
by colors of pigments in cells
Why do marine snails have different shell shapes and sizes?
shells have changed over time to help snails survive in their environment/avoid predators
What structure in a crayfish helps it sense its surroundings?
antennae
What are three defining characteristics of echinoderms?
spiny skin, tube feet, water vascular system, endoskeleton
How do sponges benefit marine animals?
provide a habitat
Which group of mollusks contains many species without external shells?
cephalopods
What type of symmetry do arthropods have?
Bilateral
What is the main function of the water vascular system in echinoderms?
movement and feeding
What one characteristic sets sponges apart from other invertebrates?
their cells are not organized into tissues
What do all mollusks have in common?
soft-bodied animals
The madreporite in a sea star is part of which system?
water vascular system
What is the function of nematocysts (harpoon-like structure) in cnidarians?
can paralyze a cnidarian’s prey
In cephalopods, color-changing cells are located in the ___________ and help with ___________.
mantle; camouflage
How do sea stars consume their prey?
extending their stomachs outside their bodies